High Quality Content by WIKIPEDIA articles! Vortex is a KMG Afterburner at Thorpe Park, an amusement park in Chertsey, Surrey, England. It was installed in the Lost City area of the park in 2001. It opened on May 25, seven weeks after the opening of the park.GRiders sit in eats arranged in a circle facing inwards, there are eight gondolas with four seats on each. After the over-the-shoulder restraints have been lowered and checked, the platform lowers. The seats then begin to rotate, and after approximately one rotation the ride begins to swing. The ride swings back and forth, swinging up to a maximum height of 20 meters and angle of 120 degrees at 15rpm. . After several full height swings, the ride then begins to slow before coming to a halt, the platform is then raised and riders exit.